[util] Rework tearFree as a Tristate

PR #1606.

dxvk.conf

@@ -69,14 +69,21 @@
 # d3d9.presentInterval = -1
 
 
-# Enables the mailbox present mode in case regular Vsync is disabled.
+# True enables the mailbox present mode in case regular Vsync is disabled.
 # This should avoid tearing, but may be unsupported on some systems
 # or require setting dxgi.numBackBuffers to a higher value in order
-# to work properly. Please do not report issues with this option.
+# to work properly. 
 #
-# Supported values: True, False
+# False enables the relaxed fifo present mode in case regular Vsync is enabled.
+# This should result in tearing but reduce stutter if FPS are too low,
+# but may be unsupported on some systems.
+#
+# Please do not report issues with this option.
+#
+# Supported values: Auto, True, False
 
-# dxgi.tearFree = False
+# dxgi.tearFree = Auto
+# d3d9.tearFree = Auto
 
 
 # Performs range check on dynamically indexed constant buffers in shaders.

src/d3d11/d3d11_options.cpp

@@ -19,7 +19,7 @@ namespace dxvk {
     this->numBackBuffers        = config.getOption<int32_t>("dxgi.numBackBuffers", 0);
     this->maxFrameLatency       = config.getOption<int32_t>("dxgi.maxFrameLatency", 0);
     this->syncInterval          = config.getOption<int32_t>("dxgi.syncInterval", -1);
-    this->tearFree              = config.getOption<bool>("dxgi.tearFree", false);
+    this->tearFree              = config.getOption<Tristate>("dxgi.tearFree", Tristate::Auto);
 
     this->constantBufferRangeCheck = config.getOption<bool>("d3d11.constantBufferRangeCheck", false)
       && DxvkGpuVendor(devInfo.core.properties.vendorID) != DxvkGpuVendor::Amd;

src/d3d11/d3d11_options.h

@@ -73,7 +73,8 @@ namespace dxvk {
     int32_t syncInterval;
 
     /// Tear-free mode if vsync is disabled
-    bool tearFree;
+    /// Tearing mode if vsync is enabled
+    Tristate tearFree;
 
     /// Override maximum frame latency if the app specifies
     /// a higher value. May help with frame timing issues.

src/d3d11/d3d11_swapchain.cpp

@@ -850,12 +850,13 @@ namespace dxvk {
     uint32_t n = 0;
 
     if (Vsync) {
+      if (m_parent->GetOptions()->tearFree == Tristate::False)
+        pDstModes[n++] = VK_PRESENT_MODE_FIFO_RELAXED_KHR;
       pDstModes[n++] = VK_PRESENT_MODE_FIFO_KHR;
     } else {
-      if (!m_parent->GetOptions()->tearFree)
+      if (m_parent->GetOptions()->tearFree != Tristate::True)
         pDstModes[n++] = VK_PRESENT_MODE_IMMEDIATE_KHR;
       pDstModes[n++] = VK_PRESENT_MODE_MAILBOX_KHR;
-      pDstModes[n++] = VK_PRESENT_MODE_FIFO_RELAXED_KHR;
     }
 
     return n;

src/d3d9/d3d9_options.cpp

@@ -70,6 +70,7 @@ namespace dxvk {
     this->allowDiscard          = config.getOption<bool>       ("d3d9.allowDiscard",       true);
     this->enumerateByDisplays   = config.getOption<bool>       ("d3d9.enumerateByDisplays", true);
     this->longMad               = config.getOption<bool>       ("d3d9.longMad",            false);
+    this->tearFree              = config.getOption<Tristate>   ("d3d9.tearFree", Tristate::Auto);
 
     // If we are not Nvidia, enable general hazards.
     this->generalHazards = adapter == nullptr || !adapter->matchesDriver(DxvkGpuVendor::Nvidia, VK_DRIVER_ID_NVIDIA_PROPRIETARY_KHR, 0, 0);

src/d3d9/d3d9_options.h

@@ -143,6 +143,10 @@ namespace dxvk {
     /// This solves some rendering bugs in games that have z-pass shaders which
     /// don't match entirely to the regular vertex shader in this way.
     bool longMad;
+
+    /// Tear-free mode if vsync is disabled
+    /// Tearing mode if vsync is enabled
+    Tristate tearFree;
   };
 
 }

src/d3d9/d3d9_swapchain.cpp

@@ -1362,11 +1362,13 @@ namespace dxvk {
     uint32_t n = 0;
 
     if (Vsync) {
+      if (m_parent->GetOptions()->tearFree == Tristate::False)
+        pDstModes[n++] = VK_PRESENT_MODE_FIFO_RELAXED_KHR;
       pDstModes[n++] = VK_PRESENT_MODE_FIFO_KHR;
     } else {
-      pDstModes[n++] = VK_PRESENT_MODE_IMMEDIATE_KHR;
+      if (m_parent->GetOptions()->tearFree != Tristate::True)
+        pDstModes[n++] = VK_PRESENT_MODE_IMMEDIATE_KHR;
       pDstModes[n++] = VK_PRESENT_MODE_MAILBOX_KHR;
-      pDstModes[n++] = VK_PRESENT_MODE_FIFO_RELAXED_KHR;
     }
 
     return n;